Spring-jack switch



(No Model.)

R. V. FREEMAN. Y SPRNG JACK "SWITCH,

Patented Deo. 16, 1884..

linrrrn Freres ldarnnrr rtree.

RICHARD Y. FREEMAN, OF N EIV YOPIK, N. Y., ASSIG-NOR 4IO TIIE YVESTEBN ELECTRIC COMPANY, OF CHICAGO, ILLINOIS.

SPRING-.SMACK SWITCH.

SPECIFICATION forming part of Letters Patent No. 309,218, dated December 1.6, 1884.

Application filed July 25, 1884. (No model.)

To @ZZ whom, t may concern: and the said piece f through the medium of Be it known that I, Riel-IARD V. FREEMAN, the plug when the line is disconnected from 55 a citizen of the United States, residing at New the ground-point e and connected to the cord York, in the county of New York. and State o'l` of the plug, as shown in said Fig. 4. 5 New York, have invented a certain new and rIhe object in establishing a cross through useful Improvement in Spring-Jack Switches, the medium of the shank of the plug will be i of which the following is a full, clear, concise, readily understood by reference to the testing 6C and exact description, reference being had to system i'or `multiple switch-boards described the accompanying drawings, forming a part in Scribners Patent No. 305,021, of Septemro of this speciiication. ber 9, 1884.

My invention relates to spri ng-j ack switch- As shown in the drawings, the metallic es which are used upon the switch-boards of pieces or parts (l c f are extended to the rear 6- telephone-exchanges, of which the Scribner of the board, where the connections with the switchshowninPatentNo.293,l98,of February wires may be readily made. The insulated r 5 5, 1884, and the James O. Warner switch, pieces j" of the diii'crent switches are espeshown in Patent No. 281, T41, ot' July 24, 1883, cially useful in multiple syst-ems of switchmay be taken as types. boards, in which a normally-open test-circuit 70 My invention consists in making the frameis used with each telephone-line, as shown and work of several switches of a single strip ot' described in application No. 55,791, of Charles 2o insulating material, preferably wood, and E. Scribner, filed March 20, 1882, and allowed mounting the several springs or contact-pieces J une 3, 1884. In ordinary closed-circuit telethereon, as herein described. rllhe weight of phone systems these parts f may be dispensed the switches is thereby materially decreased, with, the pieces d c being sufficient tofdo all while better insulation between the various the work required. parts is maintained, better contacts insured, My switch is not limited to anyA particular and the cost of construction lessened. system or systems of circuits, but may be used My invention is illustrated in the aecompawherever itis adapted to do the work required. 8O nying drawings, in which Figure l is a vertil rIhe strips c b c, as shown, are attached to the cal sectional view of a portion of a switchrear of the board. eIt is evident, however, 3o board and three spring-jack switches mount-ed that by making the strips widerthe switchon different strips. Fig. 2 is a horizontal secboard may be built up of sections or strips tional view, as indicated by line :v .c or Fi g. 1, carrying any required number of spring-jacks.

showing a single strip carrying the springs or I claim as my invention and desire to secure connecting-pieces of several switches. Fig. 3 by Letters Patent-- 35 is a central sectional view of a single spring- I. A spring-jack switch consisting of the `iack. Fig. 4 is a similar view with the conlever d, the ground-connection e, and the me-` necting-plug inserted. tallic socket f, mounted on a wooden strip, in

Like parts are indicated by similar letters combination with a plug adapted, when inof reference in the different figures. ser-ted, to separate the parts d and e and 4o The strips c b c (shown in Fig. 1) may each form a connection between parts d and f, subserve as the frame-work or support of' several stantially as and for the purpose specified. switches. Thus, as shown in Fig. 2, the strip 2. The combination, with the strip of insuc Carries the metallic parts oi' several switchlating materiahof several spring-jack switches es, l 2 3, Sie. mounted thereon, each consisting of the lever t5 Each spring-jack switch consists of three or spring d, the ground-connection c, and the y metallic parts-the spring or lever d, to which insulated socket f, substantially as and for the the line-wire may be connected, the insulated purpose specified. 1Q@ ground-connection e, against which the said In witness whereof I hereunto subscribe my lever d normally rests, as shown in Figs. l and name this 28th day of llune, A. D.. 1884.

5o 3, and the insulated tube or socket f, with RICHARD Y. FREEMAN.

which a connection is made by the shank of lVitnesses: the plug when inserted, as shown in Fig. 4, GEO. M. PHELIS, Jr.,

thus establishing a cross between the spring d A. I. ARMSILRONG?. 

